EXPLANATION OF PLATE XXXIL 



Fig. 



1-8. ICHTHYOPHTHIRIUS MULTIFILIIS, Fouquet, vol. ii. p. 530. — I, Adult animalcule, 

 X 120 ; 2-5, successive phases of segmentation following upon encystment, 

 and resulting in the subdivision of the entire body-mass into a swarm of 

 minute ciliated germs ; 6, ciHated germ, x 350 ; undeveloped germ with 

 twisted thread-like cuticular extensions of the opposite poles ; 8, oral 

 apparatus viewed from above (Fouquet). 

 9. Paramecium marinum, S. K., vol. ii. p. 488, x 250. 

 10. Lembus elongatus, C. & L. sp., vol. ii. p. 549, X 300 (Clap. & Lach.). 

 II, 12. Marvna SOCIALIS, Gruber, vol. ii. p. 520. — 11, Social colony within branched 

 granular zoothecium, x 60 ; 12, isolated animalcule, x 120 (Gruber). 



13. Tillina magna, Gruber, vol. ii. p. 514, x 190 (Gruber). 



14, 15. Haptophrya GIGANTEA, Maupas, vol. ii. p. 569 — 14, Adult animalcule, ventral 

 aspect, X 33 ; 15, acetabulum, x 50 (Certes). 



16. LOXOCEPHALUS LURIDUS, Eberhard, vol. ii. p. 489, x 100 (Eberhard). 



17. Enchelyodon ELONGATUS, C. & L., vol. ii. p. 504, X 1 50 (Clap. & Lach.). 



18. Metopides CONTORTA, Ouenn., vol. ii. p. 583, x 275 (Quennerstedt). 



19. Opalina ranarum, Purk., vol. ii. p. 559. — Showing temporarily assumed 



parallel disposition of the cilia as observed by the author, x 100. 



20, 21. Nyctotherus Gyceryanus, Stein, vol. ii. p. 580. — Ventral and lateral aspects, 

 X 200 (Stein). 



Balantidium medusarum, Meresch., vol. ii. p. 57S, x 600 (Mereschkowsky). 



Calceolus cypripedium, J.-Clk. sp., vol. ii. p. 619. — Ventral and lateral 

 aspects, X 200 (Jas.-Clark). 



Dictyocysta mitra, Hid., vol. ii. p. 623. — 26, Empty lorica, x 230 (Haeckel). 



DiCTYOCYSTA templum, Hkl., vol. ii. p. 625. — Empty lorica, x 400 (Haeckel). 



Dictyocysta tiara, Hkl., vol. ii. p. 626. — Empty lorica, x 400 (Haeckel).' 



Dictyocysta cassis, Hkl., vol. ii. p. 624. — 29, Empty lorica, showing cribrate 

 structure, X 165 ; 30, extended animalcule, containing germinal bodies ^, 

 depending from its lorica, X 165 ; 31, isolated germ, x 300 (Haeckel). 

 32-34. Torquatella typica, Lankester, vol. ii. p. 621. — 32, Animalcule with oral 

 membrane contracted; 33 and 34, examples, viewed laterally and from 

 above, with this structure variously expanded. Dimensions unrecorded 

 (Ray Lankester). 

 35-38. Halteria grandinella, Miill. sp., vol. ii. p. 632. — 35 and 36, Lateral and 

 ventral aspects, x 600 ; 37, animalcule dividing by transverse fission ; 38, 

 example with its springing-setje deflected in the act of leaping. 



39. Halteria volvox, Eichwald, vol. ii. p. 632, x 250 (ClaparMe & Lachmann). 



40. Mesodinium acarus. Stein, vol. ii. p. 635, x 400, as observed by the author. 



41. Arachnidiu.m convolutum, S. K., vol. ii. p. 638, X 400. 



42, 43. Arachnidium bipartitum. From, sp., vol. ii. p. 638. — 42, Ambulatory, and 43, 

 free-swimming examples, x 400 (De Fromentel). 



44. Mesodinium pulex, C. & L. sp., vol. ii. p. 636, x 350 (Clap. & Lach.). 



45. Acarella SIRO, Cohn, vol. ii. p. 636, x 250 (Cohn). 



46. Strombidium Claparedii, S. K., vol. ii. p. 634, x 200. 



47. Strombidium sulcatum, C. & L., vol. ii. p. 633, x 200 (Clap. & Lach.). 



48, 49. Arachnidium globosum, S. K., vol. ii. p. 637. — Examples with tentacles 

 extended and contracted, x 1 200. 



50-57. Didinium nasutum, Miill. sp., vol. ii. p. 639.— 50, Normal aspect of natatory 

 animalcule, as observed by the author, x 200; 51 and 52, illustrating the 

 seizure and engulfment of a Paramaciuni as delineated by Balbiani ; 53 and 

 54, aspects antecedent to and attending transverse fission (Balbiani); 55, 

 example of abnormal multiple subdivision as delineated by Eberhard; 

 56 and 57, embryonic conditions, after Balbiani. 



